1) Base 2) Base, chemically speaking 3) Basic, to a chemist 
• (a.) Destitute of acid properties; hence, basic; metallic; positive; -- said of certain atoms and radicals. • (a.) Destitute of acid properties; hence, basic; metallic; positive; -- said of certain atoms and radicals.
Non·ac'id adjective (Chemistry) Destitute of acid properties; hence, basic; metallic; positive; -- said of certain atoms and radicals.